Multiple safety fuse



Patented Aug. 4, 1925.

UNITED STATES EDUARDO ANTINORO, GF ROME, ITALY, ASSIGN'OR TO THE COMPANY MARIO GOBBO E 1,548,111 PATENT OFFICE..

LIQUIDATOR or THE" SOCIETA ANONMA. n I. v. E. n., ory FLORENCE, ITALY.

MULTIPLE SAFETY rUs'n Application filed .Tune 1921.

To all 'whom t may concern.'

Be it known that I, Ermanno AN'riNono, a subject of the King of Italy', and residing atRome, Italy, whose post-office address is,

5 Via Mecenate 9,5, lto1ne-,Itally,l have invented certain new and. useful Improvements'. in Multiple Safety Fuses, ofwhich the following is a: specication.

This invention` relates to improvements in and modifications of the multiple safety fuse described in patent application No. 363,041 of March 3rd, 1920. In the constructiondisclfosed in said prior application, the contacts are disposed onv the bottom of the safety box, in an angular position, correspond-ing tothe number of wires, comprising the circuit to be protected. The improvements and modification according to'. the present invention consists in the contacts being placed both on the bottom and cover of the safety box, by which the construction of the device becomes simpler and more compact. A further modification and improvement resides in the rotatable plug containing longitudinal passageways provided at their ends with protecting covers of metal, so that the changing of molten fuse wires may be expeditiously accomplished without diii- Y culty. Each of the metal covers contains a central aperture for the introduction of fuse wires that is provided with a conical recess adapted to guide the point of the wire into the passageway.

The invention is illustrated in the accomr panying drawings in which:

Figures 1 to 5 represent a fuse for monopolar or multipolar circuits. In said drawings, Fig. 1 is a front view of a fuse box.

Fig. 2 is a top plan view of the same.

Fig. 3 is a cross section on the lines 1, 2, 3, 1, 5 and 6 of Fig. 1.

Fig. L1 is a posterior view of the box shown in Fig.2.

Fig. 5 is a plan view of the inner face of d the cover.

In the embodiment of the invention shown in the drawings, the rotatable plug is a solid body A preferably of cylindrical shape and having parallel holes arranged near its periphery and extending in the direction of its axis. These holes are adapted to receive the fuse wires c, and the outer ends of the holes are enlarged to receive hollow metallic terminals d, which are connected to the plug A and to v,the wires c by means of Serial No. 477,742.

screws e. TheI outer ends of the terminals Z are provided with recesses f adapted to receive the buttons g arranged at the ends of contacts 7b2, h3 and p. The contacts 7a2 and h3 are carried by current conveying strips L and andthe outer ends-i5 of these strips are.providedwith holes to receiye the screws employed in connecting the conducting wires toA said strips.. Other conducting strips Z areY arranged along they inner face of the.v wall of the casing and their rear ends are bent at right angles as shown at m in order to: receive. the screws employed in connecting the current; conducting wires to the strips Z. rIhe ends z' and m ofsaid strips are arranged in recesses provided in the back of the; casing.

The parts` a ot the strips Z arev bentv at right angles tothe intermediate portions of said strips and rest on the front edge of the casing, so that they may contact with current conducting strips 0, 0 carried by the cover. Said strips 0, o are connected to the contacts p, p.

After closing the box by means of the nuts g, contacts 7b2, and 71,3 and p possess sufficient resiliency to permit intermittent rotation of the plug A.

It will be noted that the inner end of the bore of each tubular terminal Z is of substantially frustro-conical shape to facilitate the threading of the wire c into the terminal.

From the foregoing it is believed that the construction and arrangement of parts may be readily understood and it is obvious that change-s may be made in the details disclosed without departing from the spirit of the invention as expressed in the claims.

What is claimed and desired to be secured by Letters-Patent is 1. A multiple safety fuse for electric circuits comprising a casing, a rotatable plug arranged in said casing and provided with a plurality of longitudinal extending openings therein, fusible wires passing through said openings, contact terminals secured to the plug, and connected to the opposite ends of said wires, and resilient contact members carried by the bottom and cover of said casing in position to contact with a plurality of said terminals, the cont-acts in the bottom and cover of said box being disposed in angular positions, corresponding to the number of pole lines to be protected.

2. A multiple safety fuse including a closed casing, a rotatable plug arranged in the easing and formed of insulating material, said plug being provided with a series of apertures arranged around and parallel to its axis, hollow metal terminals arranged in the ends of the apertures, wires extending through said apertures and having their ends anchored in said terminals, contacts ar- 'anged on the top and bo-ttom of said casing and provided with buttons adapted to engage said terminals, conductor strips connccted with said contacts and having their ends extending to the exterior of said bottom, and electric conducting wires connected to said strips.

3. A multiple safety fuse including a closed casing, a rotatable plug formed of insulatingmaterial, arranged in the casing and having a handle projecting to the exterior of the casing, said plug being provided with a circular series of apertures arranged around and parallel to its axis, hollow terminals of conducting material arranged at the ends of the apertures, fusible wires ex tending through said apertures and having their ends anchored in said terminals, contacts arranged on the top and bottom of said casing and provided with buttons arranged to engage said terminals, conductor strips connected with said contacts and having their ends extending to the exterior of the casing, and electric conducting wires connected to said strips.

t. A multiple safety fuse including a casing consisting of a bottom, top and an endless wall, a rotatable plug of insulating material arranged in the casing and having a handle projecting through the top, said plug being provided with a series of apertures arranged around and parallel to its axis, hollow metal terminals arranged at the ends of the apertures, fusible wires extending through said apertures and having their ends anchored in said terminals, contacts arranged on the top and bottom of said casing and provided with buttons adapted to engage said terminals, conductor strips ar ranged in the casing, connected to said contacts and having their ends extending to the exterior of said bottom, and electric conducting wires connected to said strip.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

EDUARDO ANTINORO.

Witnesses DUiLro NARDAN, PiE'rRo Tn'r'rnn. 

